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Forum Discussion

Pantelis_Karbal's avatar
Pantelis_Karbal
Icon for Nimbostratus rankNimbostratus
May 02, 2008

SMTP load balance

Hello,

 

 

Attempting to load blamance my SMTP servers however I need to "preserve the clients original IP" for loging etc...

 

 

Is there any way to do so ? Stop the LTM from doing the SNAT/NAT and preserving the original IP ?

 

 

Thanks in advance for any information !!!

 

 

Pantelis
microsoft
partner

2 Replies

  • Ryan_Korock_46's avatar
    Ryan_Korock_46
    Historic F5 Account
    May 03, 2008
    Pantelis,

     

     

    Modifying the source IP address via SNAT is an option that is most commonly used in order to ensure server responses are properly routed back through the BIG-IP, however it is not required for SMTP load balancing if your internal routing is set up correctly. If your SMTP servers will already route response traffic back through the BIG-IP without having the BIG-IP modify the source IP, then you can go ahead and disable SNAT on the Virtual Server, and your SMTP servers will 'see' the true source IP of the connection.

     

     

    Let me know if this helps

     

    -Ryan
  • Reuben_Turner_7's avatar
    Reuben_Turner_7
    Icon for Nimbostratus rankNimbostratus
    Apr 01, 2010
    Hello all,

     

     

    I have this same issue but my SMTP servers are not directly connected to the same LAN as my F5's. IS there a solution to this query based on this scenario. Please advise.

     

     

    Regards,